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Math Help - Help with Division and Quadratic equation

  1. #1
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    Help with Division and Quadratic equation

    1) Calculate the divisions
    5 3i/2 + i

    4i/2 -i



    2) Solve the quadratic equations:

    x2 + 2x + 3 = 0

    X2 + 4x + 5 = 0
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  2. #2
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    Quote Originally Posted by Kblack View Post
    1) Calculate the divisions
    5 3i/2 + i

    4i/2 -i



    2) Solve the quadratic equations:

    x2 + 2x + 3 = 0

    X2 + 4x + 5 = 0
    Use the quadradic formula and post what you get so we can check.
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Kblack View Post
    1) Calculate the divisions
    5 3i/2 + i

    4i/2 -i
    to divide by a complex number, we multiply by it's conjugate over itself, thus:

    \frac {5 - 3i}{2 + i} = \frac {5 - 3i}{2 + i} \cdot \frac {2 - i}{2 - i}

    and

    \frac {4i}{2 - i} = \frac {4i}{2 - i} \cdot \frac {2 + i}{2 + i}

    now simplify
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